ジャッカス

noun

jackass; fool; idiot

Casual insult for a stupid or obnoxious person, borrowed from English. Used similarly to バカ or アホ but with a slightly foreign flavor.

• あいつは本ほん当とうにジャッカスだな。

  That guy is a real jackass.

• ジャッカスみたいなことを言いうなよ。

  Don't say things like a jackass.